Debian GNU/Linux is an operating system. I run it since 2008.
Debian GNU/Linux is free and open source.
Debian Official Website
Debian Page on Wikipedia
Free Software Free Software Foundation
The Free Software Foundation (FSF) is a non-profit organization founded by Richard Matthew Stallman. He gives the free software definition:
"A program is free software if the program's users have the four essential freedoms:
- The freedom to run the program as you wish, for any purpose (freedom 0).
- The freedom to study how the program works, and change it so it does your computing as you wish (freedom 1). Access to the source code is a precondition for this.
- The freedom to redistribute copies so you can help others (freedom 2).
- The freedom to distribute copies of your modified versions to others (freedom 3). By doing this you can give the whole community a chance to benefit from your changes. Access to the source code is a precondition for this."
FSF Official Website
FSF Page on Wikipedia
GNU is a collection of free software. It respects users' freedom.
GNU Official Website
GNU Page on Wikipedia
Linux is a free operating system kernel created by Linus Torvalds.
Linux Official Website
Linux Page on Wikipedia
Toile Libre can host websites, mails and other services. It only uses free software. I use their services since 2009. The cost is what-you-want.